渤海海域渤中凹陷渤中19-6深层潜山凝析气藏的充注成藏过程

doi:10.11743/ogg20200501

Abstract

Abstract:

The sources' charging and possible accumulation processes of hydrocarbon in the BZ 19-6 buried hill reservoirs were investigated based on analyses of the geochemistry of condensate samples, the hydrocarbon generation history of source rocks in neighboring sags, and the petrology, homogenization temperature and GOI values (frequency of quartz grains containing oil-bearing inclusions) of fluid inclusions.The results reveal that the gas condensate in the BZ 19-6 reservoirs is high in thermal maturity and its corresponding source rocks have R_o values approximately 1.3%.The light hydrocarbon and carbon isotopic compositions as well as biomarkers all point to oil-prone source rocks in the Shahejie Formation (Es³ and Es¹).Most hydrocarbon inclusions are distributed in the micro-cracks of quartz, with only a few scattering at the overgrown edge.Liquid hydrocarbon inclusions have yellow-green and blue-white fluorescent, with a GOI value of up to 80%, indicating an almost fully-charged reservoir.The gas condensate reservoirs in the Bozhong Sag are characterized by nearby source rocks with continuous charging of early oil and late gas.The oil charging concentrated during the deposition of the Lower Minghuazhen Formation (12-5.1 Ma), and the large-scale gas charging occurred in the late stage of the Lower Minghuazhen Formation or even later (5.1-0 Ma).Despite an obvious vertical migration of oil and gas during the Neotectonic Movement, the rapid maturation of source rocks and strong near-source charging are considered to be a more important physical foundation for the dynamic hydrocarbon enrichment in deep buried hills of activation zones.

Key words: source of condensate oil and gas, charging history, BZ 19-6 buried hill, Bohai Sea, Bohai Bay Basin

CLC Number:

TE122.3

Yong'an Xue, Qi Wang, Chengmin Niu, Quanyun Miao, Mengxing Liu, Jie Yin. Hydrocarbon charging and accumulation of BZ 19-6 gas condensate field in deep buried hills of Bozhong Depression, Bohai Sea[J]. Oil & Gas Geology, 2020, 41(5): 891-902.

Figures/Tables 14

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井号	层位	深度/m	密度/(g·cm^-3)	相对密度/° (API)	粘度/(mPa·s)	蜡含量/%	沥青质含量/%	胶质含量/%	硫含量/%
BZ19-6-A	E_1-2k	3 566.8~3 634	0.79	45.60	1.41	14.13	0.31	0.79	0.02
BZ19-6-A	E_1-2k	3 521.1	0.86	31.80	8.13	18.73	3.52	8.97	—
BZ19-6-A	Ar	4 043.4~4 142	0.79	46.04	1.24	11.80	0.15	0.84	0.02
BZ19-6-B	Ar	3 873.7~3 923.5	0.80	44.11	1.65	14.64	0.15	0.28	0.13
BZ19-6-B	Ar	3 879~3 998.66	0.81	42.34	2.29	15.82	0.20	1.34	0.02
BZ19-6-C	E_1-2k	4 079.18	0.79	47.39	2.06	7.32	0.02	0.57	0.01
BZ19-6-D	Ar	4 411~4 499.80	0.80	44.71	1.72	17.62	0.16	0.69	0.01
BZ19-6-E	E_1-2k	3 500~3 566	0.79	46.26	—	10.11	0.72	0.91	0.02
BZ19-6-E	E_1-2k	3 901.5	0.82	40.85	2.50	20.52	0.26	2.30	0.04

大类		烃包裹体				含烃包裹体		非烃包裹体
亚类		黄绿色荧光烃包裹体	蓝白色荧光烃包裹体	甲烷气烃包裹体		含甲烷气盐水包裹体		CO₂三相包裹体	CO₂气包裹体	盐水包裹体

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Hydrocarbon charging and accumulation of BZ 19-6 gas condensate field in deep buried hills of Bozhong Depression, Bohai Sea

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